<!DOCTYPE html>
<style>
  span span span::before {
    counter-increment: item;
    content: counter(item, -moz-thai) "." counter(item, -moz-thai) "." counter(item, -moz-thai);
    content: counter(item, thai) "." counter(item, thai) "." counter(item, thai);
  }
</style>
<span><span><span></span></span></span>
